HalfRuns
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Sylvia Costello

FemaleCalifornia2005–2026

11

Total Finishes

10

Different Races

1

States (2%)

2:05:10

PR (9:33/mi)

2:27:33

Average

+0:41:44

Slower (first to last)

Medal House

2026

Livermore Half Marathon

2:09:19
#890 overall#282 gender
2026

Wildcat

2:50:16
#52 overall
2025

Knickerbocker Canyon Trail Run

2:58:44
#40 overall
2025

Knickerbocker Canyon Trail Run

2:58:44
#40 overall#13 gender
2024

Mt. Tam Trail Run

3:09:15
#75 overall
2009

Life Time Chicago Half Marathon + 5K

2:14:24
#7162 overall#3240 gender
2008

Rock 'n' Roll San Jose

2:11:25
#4374 overall#1673 gender
2008

Davis Stampede

2:11:42
#393 overall#157 gender
2007

Surf City Marathon

2:05:35
#2921 overall#1145 gender
2006

Surf City Marathon

2:05:10
#2296 overall#912 gender
2005

Run SF "Golden Gate City" 5K/10K/13.1

2:08:32
#359 overall#358 gender

Performance Timeline

PR 2:05:1020052:08:3220062:05:1020072:05:3520082:11:2520082:11:4220092:14:2420243:09:1520252:58:4420252:58:4420262:09:1920262:50:16

Complete Race Log

YearRaceStateTimePlace
2026Livermore Half MarathonLivermoreCA2:09:19#890
2026WildcatEl SobranteCA2:50:16#52
2025Knickerbocker Canyon Trail RunAuburnCA2:58:44#40
2025Knickerbocker Canyon Trail RunAuburnCA2:58:44#40
2024Mt. Tam Trail RunStinson BeachCA3:09:15#75
2009Life Time Chicago Half Marathon + 5KChicagoIL2:14:24#7162
2008Rock 'n' Roll San JoseSan JoseCA2:11:25#4374
2008Davis StampedeDavisCA2:11:42#393
2007Surf City MarathonHuntington BeachCA2:05:35#2921
2006Surf City MarathonHuntington BeachCA2:05:10#2296
2005Run SF "Golden Gate City" 5K/10K/13.1San FranciscoCA2:08:32#359

States Raced

1 race 2 races 3-4 races 5+ races

State Breakdown

CACalifornia
10 races

50-State Challenge

1/ 51 states + DC

50 states to go